The Collaborative International Dictionary of English v.0.48:

Salience \Sa"li*ence\, n. [See Salient.]
   1. The quality or condition of being salient; a leaping; a
      springing forward; an assaulting.
      [1913 Webster]

   2. The quality or state of projecting, or being projected;
      projection; protrusion. --Sir W. Hamilton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

salience
    n 1: the state of being salient [syn: salience, saliency,
         strikingness]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "salience":
   arrantness, bas-relief, bellying, blatancy, boldness, bulging,
   conspicuousness, dignity, distinction, embossment, eminence,
   esteem, excrescence, excrescency, extrusion, fame, flagrance,
   flagrancy, gibbosity, gibbousness, glory, greatness, high relief,
   honor, low relief, memorability, notability, noteworthiness,
   noticeability, notoriety, notoriousness, obtrusiveness,
   ostentation, outstandingness, prestige, projection, prominence,
   pronouncedness, protrusion, protuberance, protuberancy, relief,
   remarkableness, renown, reputation, repute, saliency, salient,
   strikingness, strong relief, tuberosity, tuberousness